The Wallace-Darwin Correspondence 



and always constant in each species yet confined to the 

 males, and so small and mixed up with the other scales as 

 to produce no effect on the colour or marking of the wings. 

 How could sexual selection produce them ? 



Your correspondent Mr. Geach is now in England, and 

 if you would like to see him I am sure he would be glad to 

 meet you. He is staying with his brother (address Guild- 

 ford), but often comes to town. 



Hoping that you have quite recovered from your acci- 

 dent and that the great work is progressing, believe me, 

 dear Darwin, yours very faithfully, j^^^^^^ ^ Wallace. 



P.S. — You will perhaps be pleased to hear that Ger- 

 man, French, and Danish translations of my '* Malay 

 Archipelago ^' are in progress. — A. R. W. 



Caerleon, Barmouth, N, Wales. June 25, 1869. 



My dear Wallace, — ^We have been here a fortnight, and 

 shall remain here till the beginning of August. I can say 

 nothing good about my health, and I am so weak that I 

 can hardly crawl half a mile from the house; but I hope 

 I may improve, and anyhow the magnificent view of Cader 

 is enjoyable. 



I do not know that I have anything to ask Mr. Geach, 

 nor do I suppose I shall be in London till late in the 

 autumn, but I should be particularly obliged, if you have 

 any communication with Mr. Geach, if you would express 

 for me my sincere thanks for his kindness in sending me 

 the very valuable answers on Expression. I wrote some 

 months ago to him in answer to his last letter. 



I would ask him to Down, but the fatigue to me of 

 receiving a stranger is something which to you would be 

 utterly unintelligible. 



I think I have heard of the scales on butterflies; but 



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